• Korean Journal of Psychosomatic Medicine
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• v.5 no.2
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• pp.151-157
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• 1997

The relationship of stress and psychopathology with subjective or objective tinnitus intensity was investigated in 43 patients with tinnitus. Global assessment of recent stress scale, Beck depression inventory and symptom checklist-90-revision were used to measure stress perception and psychopathology. Subjective tinnitus intensity was assessed by subjective tinnitus severity inventory, whereas objective tinnitus intensity was assessed by tinnitogram. Scores of perceived stress related to interpersonal relationship and sickness or min had significantly positive correlation with subjective tinnitus intensity. In psychopathology, scores of somatization, interpersonal sensitivity, depression, anxiety, phobia, paranoid ideation, psychoticism had significantly positive correlation with subjective tinnitus intensity. However, stress perception and psychopathology did not significantly correlate with objective tinnitus intensity. These findings suggest that tinnitus may be associated with stress perception and multiple psychopathology including anxiety and depression. Thus, it is emphasized that Psychosocial intervention as well as effective consultation-liasion activity is needed for evaluation and treatment of patients with tinnitus.

• Nuclear Engineering and Technology
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• v.21 no.2
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• pp.89-98
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• 1989

The expanding copper mandrel test performed at three strain rates (3.2$\times$10E -5/s, 2.0$\times$10E-6/s and 1.2$\times$10E-7/s) over 553-873 K temperature range by varying the heating rates (8-1$0^{\circ}C$/s, 1-2$^{\circ}C$/s and 0.5$^{\circ}C$/s) in air and in vacuum (5$\times$10E-5 torr). The yield stress peak, the strain rate sensitivity minimum and the activation volume peaks could be explained in terms of the dynamic strain aging. The activation energy for dynamic strain aging obtained from the yield stress peak temperature and strain rate was 196 KJ/mol and this value was in good agreement with the activation energy for oxygen diffusion in $\alpha$-zirconium and Zircaloy-2 (207-220 KJ/mol). Therefore, oxygen atoms are responsible for the dynamic strain aging which appeared between 573 K and 673 K. The yield stress increase due to the oxidation was obtained by comparing the yield stress in air with that in vacuum and represented by the percentage increase of yield stress ( $\sigma$$^{a}$ $_{y}$ - $\sigma$$^{v}$ $_{y}$ / $\sigma$$^{v}$ $_{y}$ ). The slower the strain rate, the greater the percentage increase occurs. In order to estimate the yield stress of PWR fuel cladding material under the service environment, the yield stress in water was obtained by comparing the oxidation rate in air that in water assuming the relationship between the oxygen pick-up amount and the yield stress increase.

• Archives of design research
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• v.16 no.3
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• pp.161-174
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• 2003

Choice and use of color are very important field for designer. Present color sprang by central field of design business unlike past. Color is used mainly by three fields of sensitivity, administration, mind. But, do substantial design including all of three fields at use. Practical research field that is based on basic research when see as actuality of domestic color design is been behind real condition. Specially, color sensitivity field and color management field are very important field, it can speak that color name arid related area are most important among two. Because collar name includes sensitivity and color management. This research constructs correct data because investigate and analyze and search all compatible color names that is announced in existing or is recorded in public cosmopolitanly. As a result, it is to promise accuracy when produce creation of idea and result of design using color name. Examined laying stress on color that domestic data that is used in research is basis with Korean industrial Standard, connection literature, on-the-spot probe. International data investigated American ISCC-NBS to base. Other abroad color name data examined official data of each country all systematically with Japan, Europe. Findings about 11,000 basis color names and 33,000 application color names sorted collection. Collection method and classification system follow in international standard and arranged for user's tile convenience. Also, use frequency did laying stress on Munsell that is high color system so that can aid in industrial design business. Improved to write all international standard color values sue as RGB, CMYK, XYZ and can be applied all in each field of design. Is applying and get along with continuation improvement and development in homepage of present KIDP, it may become more worth research.

• The Korean Journal of Nuclear Medicine
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• v.32 no.2
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• pp.137-142
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• 1998

Purpose: $^{99m}Tc$-tetrofosmin(TF) is a recently proposed myocardial imaging agent which has similar biokinetic characteristics to $^{99m}Tc$-sestamibi(MIBI). The aim of this study was to compare TF and MIBI myocardial perfusion SPECTs in detecting coronary artery disease. Materials and Methods: One hundred and sixty patients(101 males, 59 females, mean age $57{\pm}9yr$) who had undergone both myocardial perfusion SPECT(M-SPECT) and coronary angiography within 1 month were studied. M-SPECT was performed using TF in 115 patients and MIBI in 45 patients. Stress-rest one day protocol was used in all patients. A coronary stenosis was considered significant when the luminal diameter ${\geq}$50% was compromised. The chi square test was used to compare differences in sensitivity and specificity between the two groups. Results: There was no difference in age and diseased coronary artery branches between the two groups. There were more male patients in TF group: Male-to-female ratios of TF and MIBI groups were 78:37 and 23:22, respectively(p<0.05). The overall sensitivity of TF study was 92% and specificity 36%. The overall sensitivity and specificity of MIBI study were 93% and 30%, respectively. There was no difference between TF and MIBI groups in identifying individual diseased coronary artery branches. Conclusion: One day stress-rest myocardial SPECT using either TF or MIBI was comparable and was a very sensitive test in detecting coronary artery disease.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.10
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• pp.45-50
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• 1999

We report a solder-clad fiber Bragg grating(FBG) temperature sensor in order to obtain better Bragg wavelength sensitivity to temperature than a bare FBG sensor. The solder-clad FBG sensor shows a wavelength sensitivity improvement by a factor of four compared to the case of a bare FBG sensor at temperatures below $110^{\circ}C$. However, it has a sensitivity of 0.01 $nm/^{\circ}C$ at temperatures over $110^{\circ}C$, which is identical to that of a bare FBG sensor. Bragg wavelength of the sensor shows a blue-shift below $110^{\circ}C$ because the sensor is fabricated above melting temperature of solder. The thermal stress at the FBG-solder interface has been relieved by annealing, which results in a stable operation.

• Bulletin of the Korean Chemical Society
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• v.32 no.12
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• pp.4215-4220
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• 2011

This study introduces a new concept for a simple, efficient and cheap sensitivity amplification of a Quartz Crystal Microbalance (QCM) based immunosensor system for the detection of tumor necrosis factor-alpha (TNF-${\alpha}$, TNF) by using an in-built magnetic system. The frequency shift due to the applied magnetic field was successfully observed on magnetic particles labeled detection antibodies, anti-human TNF-${\alpha}$, which were bound to the immunologically captured TNF-${\alpha}$ on the gold coated quartz crystals. In the present system, the magnitude of frequency shift depends on both the strength of magnetic field and the amount of target antigen applied. Significant signal amplification was observed when the additional built-in residual stress generated by the modified magnetic particles under the magnetic field applied. Used in conjunction with a sandwich type non-competitive immunoassay format, the lower detection limit was calculated to be 25 $ngmL^{-1}$ and showed good linearity up to TNF-${\alpha}$ concentrations as high as 2.0 ${\mu}gmL^{-1}$. The sensitivity, most importantly, was improved up to 4.3 times compared with the same QCM system which was used only an antigen-antibody binding without additional magnetic amplification.

• Korean Journal of Biological Psychiatry
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• v.26 no.2
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• pp.65-70
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• 2019

Objectives The objective of this study is to investigate differences in clinical characteristics between female panic disorder (PD) patients with abortion history (PD+A) and without abortion history (PD-A). Methods We examined data from 341 female patients diagnosed with PD. We divided the patients with PD into PD+A (82 patients) and PD-A (259 patients) to compare demographic and clinical characteristics. The following instruments were applied : stress coping strategies, NEO-neuroticism, the Anxiety Sensitivity Index-Revised (ASI-R), the Albany Panic and Phobia Questionnaire (APPQ), the Beck Depression Inventory, the Beck Anxiety Inventory (BAI) and the Sheehan Disability Scale. Results Compared to the PD-A, the PD+A group showed no significant difference in coping strategies. However, significantly higher scores in neuroticism, the ASI-R, the APPQ and the BAI were observed. In terms of health-related disability, the PD+A group did not show significant difference. Conclusions Our results suggest that the PD+A group may differ from the PD-A group in trait markers such as neuroticism and anxiety sensitivity, and abortion history may be associated with panic-related symptom severity. Our study suggests that further consideration is needed on such clinical characteristics in PD patients with abortion history.

• Explosives and Blasting
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• v.38 no.4
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• pp.1-15
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• 2020

With the increase of the utilization of underground space in Korea, explosion accidents at the underground facilities such as gas pipes have occurred frequently. In urban area with high population density, individual explosion accidents are likely to spread into large complex accidents. It is necessary to investigate the effect of explosion on the stability of underground structures in urban area. In this study, a sensitivity analysis was carried out to investigate the possible influence of nearby explosion on the stability of underground structure with 8 parameters including explosion conditions and rock properties. From the sensitivity analysis using AUTODYN, the main and interaction effects of each parameters could be determined. From the analysis, it was found that the distance between explosion point and tunnel, charge weight, and Young's modulus are the most important parameters on the stress components around a tunnel.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.10a
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• pp.223-226
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• 2009

The plastics are widely utilized in the inside of vehicles. The dynamic tensile characteristics of auto-body plastics are important in a prediction of deformation mode of the plastic component which undergoes the high speed deformation during car crash. This paper is concerned with the dynamic tensile characteristics of the auto-body plastics at intermediate strain rates. Quasi-static tensile tests were carried out at the strain rate ranged from 0.001/sec to 0.01/sec using the static tensile machine(Instron 5583). Dynamic tensile tests were carried out at the strain rate ranged from 0.1/sec to 100/sec using the high speed material testing machine developed. Conventional extensometry method is no longer available for plastics, since the deformation of plastic is accompanied with localized deformation. In this paper, quasi-static and dynamic tensile tests were performed using ASTM IV standard specimens with grids and images from a high speed camera were analyzed for strain measurement. True stress-strain relations and the actual strain rates at each deformation step were obtained by processing load data and deformation images, assuming the plastics to deform uniformly in each grid.

• Journal of Environmental Science International
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• v.22 no.11
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• pp.1403-1413
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• 2013

The effects of cadmium ions ($Cd^{2+}$) on the Chl a fluorescence of Ricciocarpos natans were investigated in order to determine whether Chl fluorescence can be used as a biomarker to estimate the physiological responses of plants to cadmium stress. In all plants treated with $Cd^{2+}$, the image of Fv/Fm, which represents the maximum photochemical efficiency of PSII, changed as the $Cd^{2+}$ concentration increased, when treated for 48 h or more. Changes of ${\Phi}_{PSII}$ and $Q_P$ images were recognized even at 10 ${\mu}M$ $Cd^{2+}$. The Chl a O-J-I-P fluorescence transient was also affected even at 10 ${\mu}M$ $Cd^{2+}$. The fluorescence yield decreased considerably in steps J, I and P in plants treated with $Cd^{2+}$, although a typical polyphasic rise was observed in non-treated plants. The Chl fluorescence parameters, Fm, Fv/Fo, Sm, SFIabs, PIabs and ETo/CS, decreased as the $Cd^{2+}$ concentration increased, while the Mo and Kn parameters increased. Peroxidase activity decreased significantly and catalase activity increased as the $Cd^{2+}$ concentration increased. Because of its sensitivity to $Cd^{2+}$ Ricciocarpos natans is useful in experiments investigating the responses of plants to cadmium exposure. Several parameters (Fm, Fv/Fo, Sm, SFIabs, PIabs, ETo/CS, Mo and Kn) can be applied to determine quantitatively the physiological states of plants under cadmium stress.